C-doped ZnS-ZnO/Rh nanosheets as multijunctioned photocatalysts for effective H2 generation from pure water under solar simulating light

Sovann Khan*, Minyeong Je, Nhan Nu Thanh Ton, Wenwei Lei, Toshiaki Taniike, Sayaka Yanagida, Daisuke Ogawa, Norihiro Suzuki, Chiaki Terashima, Akira Fujishima, Heechae Choi*, Ken ichi Katsumata

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

49 Citations (Scopus)

Abstract

A combined solvothermal method and post-annealing to synthesize highly active ZnS-ZnO nanosheets is presented. ZnO was produced on ZnS nanosheets by thermal annealing ZnS/ethylenediamine in air. From combined studies of experimental and computational works, we revealed that during annealing, carbon (C) element was a major dopant from the decomposition of ethylenediamine, which was unintentionally doped into the ZnS-ZnO, and gave major impacts on enhanced visible-light photocatalysis. Rhodium (Rh) was deposited by in situ photoreduction to form a ZnS-ZnO/Rh catalyst composite. This multijunctioned photocatalyst was outstanding for H2 generation from pure water under solar simulating light due to effective charge separation by Z-scheme heterojunction of ZnS and ZnO and Schottky junction of Rh-cocatalysts/semiconductors. This facile method realizes multijunctioned ZnS-ZnO/Rh photocatalysts with substantial defects that are very promising for solar-energy harvesting applications.

Original languageEnglish
Article number120473
JournalApplied Catalysis B: Environmental
Volume297
DOIs
Publication statusPublished - 15 Nov 2021
Externally publishedYes

Keywords

  • DFT
  • H generation
  • Nanosheet
  • Photocatalytic water-splitting
  • ZnS-ZnO

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